Anomalies in Ising metamagnets

Selke, W.*
IFF-Forschungszentrum Jülich,
D-52425 Jülich,


Ising metamagnets in a field with weak ferromagnetic intralayer interactions and highly coordinated antiferromagnetic interlayer couplings are studied using mean field theory and Monte Carlo simulations. In the antiferromagnetic phase anomalies in the magnetization and the specific heat are observed, reflecting the competing ordering tendencies of the external field and the interlayer couplings. Results are compared to recent experimental findings on FeBr_2.

*New permanent address:
Institut für Theoretische Physik, Technische Hochschule Aachen,
D-52056 Aachen,